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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a7bba3678e998082ca0db1d82da2902e96202ce02c0d1e0e646252b64091f3d' 
  AND token = '1vEnGOyy29GNJx4IW57WZkejBPZt8r1OJGzntbqOIZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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