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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17112914b420c7a3e59531b2cca2788c93cee20d9847dc8d73db95403e198d1c' 
  AND token = 'o4prcH4G11C93Ha41XptBp55tCmNRbkRjZ+VBATMMnI=' 
  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"
    }
  }
}