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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20fff45b091c9c6ade6074d77a41223c04f97eacee9d2a6b3e3b4e35b35eb952' 
  AND token = 'Zm1aSFlqEscTuPl3pp0F7kOXUi0Le8RrRlr35RMHow8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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