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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fe3c7d98a36c043d552d5d8c8785ff7ef5f9c50093998b1a2f66b3dac309978' 
  AND token = '5KAHZmFCgUxHvyjmIHYS3UPh4bcyxlWi8jZHaEU9vbk=' 
  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"
    }
  }
}