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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7602f6de29c60cbe005402b765ee6b711e009dc8fb2657272d203ed90a98494f' 
  AND token = 'cG3UaBb4kx7XkXHF/tPCNNmyiUGd6+x4zzcLoTKyp4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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