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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c29cf58335045f4263f3bebe41a044b8b122c9109e446893e2f2e88224e4c1d' 
  AND token = 'hPHMrQE4PFN42mxszMpjLa0YEFHYDGs020gIt2BSR3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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