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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2744c414bc5eb8bf77bef2abf5af6d95ec67dd2060aee062f84e369e353d2b76' 
  AND token = 'qEr4qP27X641EAD9+722nyC+64eRCFwgD+Ch8OU1o1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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