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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc2f302da9117ba2671c2699ccc35aba568e9582d5ddcb6485e3eae55a78f92d' 
  AND token = '0t2cvw8/EODQI+rtbFFkb2vzsbirFdcca4q8Kzr8WGI=' 
  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"
    }
  }
}