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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab182c7c5b8b2d605de0190d349e74a7941585f64c256d1dfe10b3d60e8e5f0c' 
  AND token = 'lWnyvPbmCjekhG+4s8ENYTnVa4WIVUAcrDZd6f2rDvE=' 
  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"
    }
  }
}