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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f926eb041ceac0e2ab8c5509b36dcd5d5b96845e2d9a6a3eb8f77b4ef334a42' 
  AND token = 'I40pMxbO2np8CAFipKTQYGIoDos3o82eyPwF2JNmJLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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