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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76cce6250d52f5bfb635dca9f4f41f0c68ef67b91375fe5ea613f14b08459319' 
  AND token = 'Z3J9loeILQi5W71jZd49JAfP2az59p70QMDpjoSq5Kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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