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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '298eefaada1cb94495a6da87a5705ddcc5384021a9ef2c97c5a89b2bb0dd0879' 
  AND token = 'DRiL9Ko60P/muDg9bLr08s1mAv9GoM8KVXmmk9pqZJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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