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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '747668326c6093ae8ac23adcc3923ac229386eb7ec500aa84c86390300043af8' 
  AND token = 'h+rCZ12rhoPpMBxQMtIzG+IivcBROp7qU+y70i4LE14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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