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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f68f366a034b1dc157e69ef35203b40993aafc7f87ac005549fe871bb7cc92f' 
  AND token = '5kScgF8aUBTm29u+LmihnQK/RXOJ0TLE6T50te1PHC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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