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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a86d867f2d0873da6b93740e0561428db05cc85276b9106b09ecfb4df9f9d816' 
  AND token = '8iasQQsccDqtV9C3Bl8ANgDb55M8VRi/pSLTvPaa6Nc=' 
  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"
    }
  }
}