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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '729ead3b50f69eb09191dab8033f863a20fb71f8b32d0bb5c685a61597e88736' 
  AND token = 'WSyzNPdnzfXD3wEak7H/Fa7pSIb8RVwc7kvdTo3nsbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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