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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0581db90e83d52bef2a1d038d5fdac6273dd654a3d1a216cd275f7423d0a6d12' 
  AND token = '1lctzC3yI2wBjZ8H45XQ88WWZmIrM8f6fE6VHboF5PA=' 
  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"
    }
  }
}