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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b78e6a7105aaff41514c275df1e904c8aa2b99877177b155ba2f717448f8fc0' 
  AND token = '4lKpPqHLUW8dGNEzZUjFMLMIYGkuhACfzq97EgbIQ/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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