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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26f967e724bda320d2ce5fdee970a0a7f1f90c369d9fe2c986642f6bbb710e29' 
  AND token = '0511BTa+wRTEGsF4gJVTct9wg2Dpp/gpHcYeaVX1f1M=' 
  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"
    }
  }
}