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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e849ee708bf8bd09c76f4c0ef4c5d80ff390a7ff86d6aa7be2c3b74a0e358875' 
  AND token = 'QeCEGXjUe6wj7gQCFG7Xq41gAttyCJO/wmlDAB9+iZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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