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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '632af1a02f6a299c1de98823168a0cf91ae800ce6dc5f2af8e959405e6c8530f' 
  AND token = 'ZoPnGSVDWi6oIclspuEsC2Cx3y8eB3h4nwPs6mrdk8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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