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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a31c6d391cefd5306d46bbaecc72fe34b31248906e236010c8afc5c87f485962' 
  AND token = '1qYnLTEuI84XDxmkSsoZz76n+HsR0zQ8cbYXRDGUiuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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