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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acf6d5fd88bb409a1da7fe67cc5cc7ba24ad1d906c9c07241b0d07537e7cce7e' 
  AND token = 'juuahPziC8MfokF0FjLRw8lqe+ZwvuwwCO+k2eRov+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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