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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3255f2747cc3d03cddb026db665ef5e43ee3ed7e07c5d13599670d0690238108' 
  AND token = '1xwlI+H5TuwaHIe6Q0ud8IRQ4ffXv6w8SqtVLvHKCak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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