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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc4e7820391cf1c0a895054e36cbacd0e383034d8057612acdc9d165baa6397e' 
  AND token = 'SV4cB4x4mbJ2+rdt6kL3pQtYpzcUzlwHqGC29mgtwIM=' 
  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"
    }
  }
}