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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '153834194b9eabf0091a2e2a5dfb47bd4ce7609ff3e564f54a05cf71f8a36b89' 
  AND token = 'XZgwz/SfOmj4g2NeJ8DE85nWW/jQ8d5X34QLPk0C32g=' 
  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"
    }
  }
}