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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f15cc97265ff1b78caba7f3ba2a88eb214f1f121fc8f67420ad34f09810c26a9' 
  AND token = 'YHAgDNYHpFai/zm2HWLe+9CtIILLIVUQKpYqrE7N6MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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