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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7c7f5dc4cfe11ccb927e9dea1d4d2aca4924ee9826cbbe310a27796c4687d6f' 
  AND token = 'FZ0PBPDuon8C/U61LAjFenQm9z/mJMj4sic+zOl2tU4=' 
  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"
    }
  }
}