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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24ede7b74b6a02c5c8d33bda81008d435851eeb9aecdbe50eaec682706dd6e53' 
  AND token = 'qLw2MIUmlGNm5dSgcCBBOXXRKA3W3nlt5Z5eBXZ8HH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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