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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18f988cae4bd72398d726e2d5e17d25c4e6b6b867de6f2efd642ce0c518e044f' 
  AND token = 'UKftH0MpkoE7aB+vncnB/K2UwK8E+uCdlZY1pv1Gr6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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