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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3229d36fee522be26cf59cd61e492b4b4ef3810d59edb37fb14b6f56fdfbc9de' 
  AND token = 'FPhBzrb0zi06FSJ2LVo5im0YwQjVwbC1w073LT+25j8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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