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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ac261b6e510771e8697841860ccb064a98896ac890b7ee82b1412bed16cb972' 
  AND token = 'LDo2Tu6yGM0jr+YDh/yzu3OYp+bHq/lnFp+nXyus2HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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