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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f23bea3edae62a8629cd17eb5cf5b84cf531175169d6c0216cd033067a23c7aa' 
  AND token = 'ShCO62bDUuVKaQlI18qdwRAGWs3iikA8DNg2EAy39hE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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