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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0febbfac4598a90a3b0efe3871090e9d5c120959d230ed5be6f1cd0d4f027f4' 
  AND token = 'XzEkbLLHpAa+/ryD7tfGhcwe7EPJuUsYxexW6m/+ODg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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