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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8b0f013495f3497adf6caa8cd2f41cf00d683e9ec8310a60cc5e2f1d548f277' 
  AND token = '+opbHNE2v45BDvLK9Dztr8rQkzxV7UZ4u1pH7WAW8KU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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