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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea0a3eb6e548aa934cd3a62073b6b3383f968804e98a9dd881f99a0a43598440' 
  AND token = 'lexUBLUpNE7WzntYAvPfoQjhN2yqc3A8YrqkfQbwjjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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