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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac7671ef9d52b098a5b5a6b552bfb24721aa2fd27c57d27a23362aa2f2518372' 
  AND token = 'cvEBmUis7h3wpC3wQhdoh2k6i46XzeJa6RMIR8f857o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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