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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b7971be29cbf48f50ac2338e620ba789811a6b88b15bb0ec8df6f2a8cbeb687' 
  AND token = '/rTKNSHlZZywnROhZKJhW+gCnhv0vhoeLBb0HxG14ZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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