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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7e2dbaeaf9b2e98c1b570f2ab7facbff0107a0d91973fc06f4933add87f99e4' 
  AND token = 'SSFyfhbnot6H8Qg3nEw5hrKItJkpamcyvOi+gTFrlkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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