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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0daf9d20bca04476db8d23aecef2d7fd6ca9093d4784f93e69e21e021ec5e9df' 
  AND token = 'uhFy8XozF8bhd5zB0TcH4Fd+by1mqnnLt2g/aZEFSP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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