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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a04d658ecff52a82de17e84a3140652233f56bf95e8f6e5b350e05c84c98daab' 
  AND token = 'Xttb7PIPaSxb22RxeWf2bPlbehvxVMCoRj6Z9aiUUJs=' 
  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"
    }
  }
}