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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74619f37bb09d7842047b69db4d9c240cfe8936636bee7fa1c62cf908d8b4801' 
  AND token = 'xRq1+Dc/1I52WVCQrPwGAAtcSHP6y6nVTpVzg+G5gl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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