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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '070ae71ca093eec4113875e6334138e9e9c18bedac21a06b19d686d1ed0de691' 
  AND token = '89il1eXrpUYNj1bvrPm8WxJKL3qQc0IWfM4vf/gD/3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}