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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb376eb2b061135312ad04bbfa3390918bb6d60257fb22758af7294de9acb4e0' 
  AND token = 'Vp+WIrqONDC7knFqbV1YP3U8Eed3agkY6u+uf9dfJo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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