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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb5b8926ffe5b470902568c897a5beb9b9da392d2d9e22205f3e9d5c87031770' 
  AND token = '8FDmabhueYcM6BJU9m6D3iJTTGn4lQRTsaeuvtQYrL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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