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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecb22094493a99240a1aadab6d542f09d3279efd0f5a15b4a343acfb7a4648d7' 
  AND token = 'cOhoH14NRDW7BhBHK13scTdXW5cMmT48P/oRfJQY2kw=' 
  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"
    }
  }
}