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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36ad7e48a25e0bad4d4d5e8fda85782686f2dfc4a6e541c0fa05f30ff4083adc' 
  AND token = 'Xdk1hzZphcjv89CC51Lw/3oUFo5VS8HpY17cH8qF9p4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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