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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f100949d806d1544986e03788555fd93ecdfa1ac8e6b1ea55e8d37d27351e2c' 
  AND token = 'rvNu3b2HKUVKkri891zt9Vt0qux5KLviRU2R6ceOGR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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