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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0e8272db2a5e3bd2fdf0620af6f4888d2f508b7f850c286b615a144f7310605' 
  AND token = 'HuMW0qx8crak8Wqn9umjU+AyR/CuE83KwoH2JdDNhKs=' 
  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"
    }
  }
}