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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0b7a258937b764d591c470185ddbf4b8eaa7a14d30de71c0826837237154df9' 
  AND token = 'Z5nmvoNVKuEr0n0nI8Nt8WLGoz9k83kAk8y9jQjzADk=' 
  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"
    }
  }
}