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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7080039d813bdec5e6f664ed28729c5b56c21be7985ad85f072a95c67528bd5' 
  AND token = 'X6BksSEsfXKoEM6/LJwd/6z18l2bkkIv8672eDSQ3Wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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