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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f45247d338f66ef8add37c9bed481703c5509d0bb26cc3c282d07949ffe52cf5' 
  AND token = '55CDWXb27DxlbZZPdKNyquXiC2cQfgIhdw6RIXu0Yvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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