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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '935978a1870bc4a628576ed1c028e28d6c8c158a137cba19b26e1aed07d8b8ef' 
  AND token = 'sXLqZKkJK6Z7hx6g57m5eCryyfKSJYDn8UW/BlhrhtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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