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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5da967619418c3529429ec14eafbd1fd66570bddfc1d6c93d3ee24c538701cdf' 
  AND token = 'dnonU5a7uWOEOPh598HxwsjG5ziE0xq5JqRD5NR2lDc=' 
  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"
    }
  }
}