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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '710a0462cb87eba779317a6b3fbeb2d14370e3f09d7593039a0b4bec2be80269' 
  AND token = 'OM2jwErvHhu5fEBYcWnfQg32TNeuvN1sSr+GG91XmfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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