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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c755459695324895db37f2755c6a87829f99b7c6642208365be704e9a964455' 
  AND token = 'y70xTXAtayF68OZfegslF8EMN2dtR1c9N+onUngfCIo=' 
  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"
    }
  }
}