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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdf764264a82a9b237d0d3b031f337fa100c569c6a8c2f978fcb0844cdda2d90' 
  AND token = '1yntWLFne5qaUSBtQUpdeMBS+fVvpozUOqJpay8Q/uI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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