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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '233864eebfb59187490c57e8610d11f3eb203ebb8a7c7eaa0c92d45b0345140d' 
  AND token = '/ESfpJ2PijW4ByN5SyAqliRyZnUXfJu2XQ8U1GFte4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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