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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27156373a0216a9a33a4f6a3ce14a32cd26140e6a3371bcfab5591b894abfe28' 
  AND token = 'si3Ruo3M3GNJUPpqYNsJFKQAMjkDJJKn63UKRRGeb2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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