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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a641db5b35ded42701ec7e007c950aa947db8e92e79f8f5dd7bf6f3f176934e5' 
  AND token = 'PcTcM0oZOQr5dBsXRQrNAm1WK6bTK7CgMykdmsqbsYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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