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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ce15869bf48d49d55f35d06fd26347cb7da3a9fd87e428b8e5032b6bbafe56e' 
  AND token = 'Aszqr+W9UbX43Hzy7ajqcmz7WD74+0bv1HdmPqLGjSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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