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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ed39fc07571b71c33127fefd884f9246e1e6b4635a2e3a55d0aefaa2f071f79' 
  AND token = '9FS0fJDD9yIspV0fJac8wNUYXPmRhHmZd75wGKGxBEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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