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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46aaa1f237c89d4587793b34bab8f2e41d74845e310843f82adbe04fd90c5691' 
  AND token = 'VP88FsGYUqfCQkopgtYr1FO+CdoXD1kRtn/MHlbNFHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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