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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ac46aebea460ab2a9995654b641dc34266d3be5ea7501a32a53352364a77048' 
  AND token = '5zDMhsrczhWjq73ltSag0IeobJbWTKU99d9bnTiT7lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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