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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b173ced1321eadcb9dd6de8dad3e543d5746e5469626887193afb65ab0374fb' 
  AND token = '1HdgDJYA9MGGh2Tf8itMIMLbzBGk8I8CzPdMX3hfprU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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